As day two of the hotly contested TWU case drew to a close at the Supreme Court, several lawyers said they expect a split judgment — but counsel on both sides were less certain about the final outcome, or what the determinative issues of the multi-layered historic case will be.

Justice Malcolm RoweThe top court reserved judgment Dec. 1 after hearing five minutes of oral argument from each of 27 interveners on the second day of the two-day TWU hearing in Ottawa. The nine judges were...